Jumbo .... that's a tricky situation to be in. Firstly, your wife is doing what any Thai would do, they won't complain or say anything that makes loss of face for the owner, it's just how Thai's are as they don't want any confrontation.
as for the guy just turning his back ... I'm not sure but either he didn't understand a word you said or he's just being Thai arrogant and obnoxious as they can be.
Let the wife handle it' stay out of it, Thai's won't listen to a farang.
Go buy a cheap bottle of Blend285 whiskey and convince the wife to go down to the house and talk to the Policemen's brother, tell him it's a gift for chinese new year or something .... then have her ask him if it's at all possible to re-locate the nice car as you can't get in your garage space ... tell her to offer any assistance if they need any.
then see how that goes ..... That's your only hope for getting some action .. imo